The woman accused of killing a Gladstone beautician has been placed under suicide watch as a precaution in Clackamas County Jail, officials said Tuesday.

Detectives arrested 53-year-old Susan Ellen Campbell on Friday, six days after authorities discovered the body of Debbie Lee Higbee Benton in her Gladstone beauty shop.

Lt. Lee Eby said guards are closely watching Campbell, which he described as normal protocol based on the charges against her.

Court documents show Campbell, also of Gladstone, confessed "to participating in intentionally causing the death of the victim" and told police where to find the weapon, which was the "same caliber as the one used in the murder of the victim," the statement said.

Neighbors have said Campbell cared for the mother of Gladstone Police Sgt. Lynne Benton, the victim's spouse.

Reached by phone Tuesday, Sandra Benton, who identified herself as Lynne's mother, said the family had no comment.

"We're just grieving for Debbie," Benton said. "We have nothing else to say." Campbell was arraigned Monday in Clackamas County Circuit Court. She is being held without bail.

Meanwhile, investigators with the Clackamas County Major Crimes Team continued to follow up on leads.

"They're still interviewing people and trying to corroborate earlier statements they took," said Officer Ulli Neitch of the Milwaukie Police Department and acting Major Crimes Team spokeswoman. "This is a long and careful process."

Neitch declined to release any more information about the case, saying that investigators are worried that public discussions and speculation could taint future interviews. Oregonian reporter Rick Bella contributed to this report.